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Item SGL - A GENERAL PURPOSE INTERACTIVE SYSTEM BUILT ON TOP OF A GKS IMPLEMENTATION(The Eurographics Association, 1980) Cunha, J.D.; C. E. VandoniThis paper presents the description of an interactive graphics system built on top of a GKS level 4 implementation. The system architecture is based on the notion of Process and the mainemphasis has been devoted to design a powerful "core", conceived as an extension of the operating system, around which different application programs can be developped with a minimum of effort.Item SGL APPLICATION - DEFINITION AND PRACTICAL USE(The Eurographics Association, 1981) Cunha, J.D.; J. L. EncarnacaoThis paper describes our experience in the development of an application using the SGL system presented in previous publications ( [2] [3] ). Special attention is paid to the pos sibilities and limitations due to GKS concepts (the SGL is implemented on top of the GKS), SGL architecture, computer confi guration and the high-level programming language (SIMULA-67) . The definition of the application and its practical use are con sidered separately.